diff options
| author | Krzysztof Halasa <khc@pm.waw.pl> | 2010-06-11 01:08:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:30:19 -0700 |
| commit | 53c6c129e33e365128dd1231b911e5996cfef0f3 (patch) | |
| tree | 42c1197e604681f267c827e85d570a8491d60088 | |
| parent | 4c4504ea2dccb7901189f6a48c3d3c0ed20d3475 (diff) | |
kbuild: Fix modpost segfault
commit 1c938663d58b5b2965976a6f54cc51b5d6f691aa upstream.
Alan <alan@clueserver.org> writes:
> program: /home/alan/GitTrees/linux-2.6-mid-ref/scripts/mod/modpost -o
> Module.symvers -S vmlinux.o
>
> Program received signal SIGSEGV, Segmentation fault.
It just hit me.
It's the offset calculation in reloc_location() which overflows:
return (void *)elf->hdr + sechdrs[section].sh_offset +
(r->r_offset - sechdrs[section].sh_addr);
E.g. for the first rodata r entry:
r->r_offset < sechdrs[section].sh_addr
and the expression in the parenthesis produces 0xFFFFFFE0 or something
equally wise.
Reported-by: Alan <alan@clueserver.org>
Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Tested-by: Alan <alan@clueserver.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | scripts/mod/modpost.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 20923613467c..17c95a384285 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1318,7 +1318,7 @@ static unsigned int *reloc_location(struct elf_info *elf, int section = sechdr->sh_info; return (void *)elf->hdr + sechdrs[section].sh_offset + - (r->r_offset - sechdrs[section].sh_addr); + r->r_offset - sechdrs[section].sh_addr; } static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r) |